You'll noticeTier: how much it should matter to you
2Useful: my rating, 1 to 5
2Signal: worth watching, 1 to 5
ElsewhereArea: what it touches
Internal ChangesKind: in v2.1.251,
Internal ChangesSection of the release
What
The served catalog of models and thinking settings per surface is now written to disk with fetch and staleness timestamps plus an etag, and expires on a jittered lifetime rather than being fetched on every use.
Details
No user-facing setting controls the cache.
Evidence
servedCatalog
Strings lifted out of the shipped bundle, so the claim above can be checked against them.